x2-x-4分之3=0
x²-x+1/4=1;
(x-1/2)²=1;
x-1/2=±1;
x=3/2或x=-1/2;
3x²+6x-5=0
3x²+6x+3=8;
3(x+1)²=8;
x+1=±2√6/3;
x=-1±2√6/3;
4x²-x-9=0
4x²-x+1/16=145/16;
(2x-1/4)²=145/16;
2x-1/4=±√145/4;
2x=1/4±√145/4;
x=1/8±√145/8;
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